drm/amdgpu: Fill out gem_object->resv

That way we can ditch our gem_prime_res_obj implementation. Since ttm
absolutely needs the right reservation object all the boilerplate is
already there and we just have to wire it up correctly.

Note that gem/prime doesn't care when we do this, as long as we do it
before the bo is registered and someone can call the handle2fd ioctl
on it.

Aside: ttm_buffer_object.ttm_resv could probably be ditched in favour
of always passing a non-NULL resv to ttm_bo_init(). At least for gem
drivers that would avoid having two of these, on in ttm_buffer_object
and the other in drm_gem_object, one just there for confusion.
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "Michel Dänzer" <michel.daenzer@amd.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Huang Rui <ray.huang@amd.com>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Cc: Evan Quan <evan.quan@amd.com>
Cc: Sonny Jiang <sonny.jiang@amd.com>
Cc: Amber Lin <Amber.Lin@amd.com>
Cc: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: Junwei Zhang <Jerry.Zhang@amd.com>
Cc: Thomas Zimmermann <contact@tzimmermann.org>
Cc: Samuel Li <Samuel.Li@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190725132655.11951-4-daniel.vetter@ffwll.ch

drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c

@@ -267,20 +267,6 @@ static void amdgpu_dma_buf_map_detach(struct dma_buf *dma_buf,
 	drm_gem_map_detach(dma_buf, attach);
 }
 
-/**
- * amdgpu_gem_prime_res_obj - &drm_driver.gem_prime_res_obj implementation
- * @obj: GEM BO
- *
- * Returns:
- * The BO's reservation object.
- */
-struct reservation_object *amdgpu_gem_prime_res_obj(struct drm_gem_object *obj)
-{
-	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
-
-	return bo->tbo.resv;
-}
-
 /**
  * amdgpu_dma_buf_begin_cpu_access - &dma_buf_ops.begin_cpu_access implementation
  * @dma_buf: Shared DMA buffer
@@ -339,8 +325,7 @@ const struct dma_buf_ops amdgpu_dmabuf_ops = {
  * @gobj: GEM BO
  * @flags: Flags such as DRM_CLOEXEC and DRM_RDWR.
  *
- * The main work is done by the &drm_gem_prime_export helper, which in turn
- * uses &amdgpu_gem_prime_res_obj.
+ * The main work is done by the &drm_gem_prime_export helper.
  *
  * Returns:
  * Shared DMA buffer representing the GEM BO from the given device.

drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.h

@@ -34,7 +34,6 @@ struct dma_buf *amdgpu_gem_prime_export(struct drm_gem_object *gobj,
 					int flags);
 struct drm_gem_object *amdgpu_gem_prime_import(struct drm_device *dev,
 					    struct dma_buf *dma_buf);
-struct reservation_object *amdgpu_gem_prime_res_obj(struct drm_gem_object *);
 void *amdgpu_gem_prime_vmap(struct drm_gem_object *obj);
 void amdgpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
 int amdgpu_gem_prime_mmap(struct drm_gem_object *obj,

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -1397,7 +1397,6 @@ static struct drm_driver kms_driver = {
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 	.gem_prime_export = amdgpu_gem_prime_export,
 	.gem_prime_import = amdgpu_gem_prime_import,
-	.gem_prime_res_obj = amdgpu_gem_prime_res_obj,
 	.gem_prime_get_sg_table = amdgpu_gem_prime_get_sg_table,
 	.gem_prime_import_sg_table = amdgpu_gem_prime_import_sg_table,
 	.gem_prime_vmap = amdgpu_gem_prime_vmap,

drivers/gpu/drm/amd/amdgpu/amdgpu_object.c

@@ -509,6 +509,8 @@ static int amdgpu_bo_do_create(struct amdgpu_device *adev,
 	if (unlikely(r != 0))
 		return r;
 
+	bo->gem_base.resv = bo->tbo.resv;
+
 	if (!amdgpu_gmc_vram_full_visible(&adev->gmc) &&
 	    bo->tbo.mem.mem_type == TTM_PL_VRAM &&
 	    bo->tbo.mem.start < adev->gmc.visible_vram_size >> PAGE_SHIFT)